There are many kinds of registered trademarks. Trademarks can sell many kinds of goods, because there are many types of trademarks that apply for registration. Trademark is a special legal term. Trademark is a sign used to identify and distinguish the source of goods or services. Any sign that can distinguish the goods of natural persons, legal persons or other organizations from the goods of others, including words, graphics, letters, numbers, three-dimensional signs, color combinations and sounds, and the combination of the above elements, can be used as a trademark.